Wow. It sounds like it was a pain to go through, but I’m glad you got it sorted out!
I don’t know enough about those GUIDs to speak confidently about them, but as one of the Northern Sky folks said, that’s a likely culprit. To be honest, I’m not sure how I would go about trying to confirm a guess like that. While I would like to venture into airport design, I just don’t have the time to commit to learning stuff like Blender and then the SDK. 
Thankfully folks like Northern Sky Studio (and others like South Oak!) have interest in producing Hawai’i airports and scenery mods.
NSS’s PHOG is friggin spectacular though.